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| Library of Congress Historic American Engineering Record | |
|---|---|
| Name | Historic American Engineering Record |
| Caption | HAER documented steam locomotive shops, bridges, and industrial sites |
| Established | 1969 |
| Location | Washington, D.C. |
| Parent | Library of Congress |
Library of Congress Historic American Engineering Record is a federal archival program documenting industrial and engineering sites across the United States. Founded in the late 1960s amid preservation efforts associated with the National Historic Preservation Act of 1966, the program created measured drawings, large-format photographs, and written histories for mills, bridges, factories, canals, railroads, dams, and shipyards. HAER records complement the National Register of Historic Places, the Historic American Buildings Survey, and the work of the National Park Service while informing scholars at institutions such as the Smithsonian Institution and universities including Harvard University, Massachusetts Institute of Technology, and University of Pennsylvania.
HAER emerged from preservation debates involving the National Trust for Historic Preservation, the American Society of Civil Engineers, and advocates such as Hubert H. Humphrey and Gifford Pinchot II. Early documentation projects responded to infrastructure changes driven by programs like the Interstate Highway System, the Tennessee Valley Authority, and urban renewal initiatives linked to the United States Department of Housing and Urban Development. Influential figures and organizations—including engineers from the American Society of Mechanical Engineers and historians at the Historic American Buildings Survey—shaped HAER’s standards during its formation under the auspices of the Library of Congress and the National Park Service.
HAER's mission addresses documentation of industrial heritage exemplified by subjects such as ironworks, textile mills, chemical plants, power stations, and transportation networks. The program focuses on engineering significance as seen in structures associated with the Erie Canal, the Transcontinental Railroad, the Panama Canal, and facilities tied to the Manhattan Project. HAER evaluates sites using criteria similar to the National Historic Landmark program and coordinates with federal agencies including the Army Corps of Engineers and the Federal Highway Administration for projects affecting documented resources.
HAER employs large-format photography, field-measured drawings, and comprehensive historical reports produced by professionals from the Library of Congress, the Historic American Buildings Survey, and academic partners like Columbia University and the University of California, Berkeley. Collections include photographic prints of suspension bridges such as the Brooklyn Bridge, truss bridges like the Eads Bridge, and industrial complexes including the Pullman Company shops and the Bethlehem Steel works. Measured drawings follow conventions used by the American Institute of Architects while reports cite archival sources from repositories such as the National Archives and Records Administration and the New York Public Library.
Major HAER projects documented iconic engineering works: the Hoover Dam survey captured hydropower and concrete technology; the B&O Railroad documentation traced railroad engineering tied to the Baltimore and Ohio Railroad and entrepreneurs like Matthew Fontaine Maury; maritime surveys covered shipyards such as the Newport News Shipbuilding site and vessels built by Henry J. Kaiser. Industrial surveys recorded textile mill complexes in Lowell, Massachusetts, coal mining infrastructure in Appalachia, and petroleum facilities linked to the Standard Oil legacy. Regional thematic surveys examined canal systems including the Ohio and Erie Canal and lumber industries centered on the Great Lakes.
HAER operates through partnerships with professional societies and academic centers: collaborations include the American Society of Civil Engineers, the Society for Industrial Archeology, the National Trust for Historic Preservation, and university programs at Northwestern University, Yale University, and Pennsylvania State University. Cooperative agreements with agencies such as the Tennessee Valley Authority, the Federal Aviation Administration, and state historic preservation offices enable documentation tied to infrastructure projects funded by the Federal Highway Administration and energy projects influenced by the Bonneville Power Administration.
Records produced by HAER are accessioned into the collections of the Library of Congress and made available through its digital archives alongside related holdings from the Historic American Buildings Survey and the Historic American Landscapes Survey. Scholars, practitioners, and preservationists from institutions like the National Trust for Historic Preservation, the American Institute of Architects, and research libraries at Cornell University and University of Michigan use HAER materials for restoration, interpretation, and education. The program’s archival standards align with policies of the National Archives and Records Administration for long-term preservation.
HAER has influenced preservation practice, engineering history, and public awareness of industrial heritage through documented examples such as the Union Pacific Railroad facilities, the Wheeling Suspension Bridge, and the legacy of industrialists like Andrew Carnegie and Henry Clay Frick. Its records support museum exhibitions at venues including the Smithsonian Institution and the National Building Museum, inform UNESCO nominations for industrial landscapes, and provide primary sources for scholarship at universities such as Princeton University and University of Chicago. HAER’s enduring legacy is visible in rescued structures, informed adaptive reuse projects, and curricula in engineering and preservation programs across the United States.